溶解浆纤维增强缓冲材料的制备及其性能研究

Study on preparation of dissolving pulp fibers reinforced cushioning material and its properties

随着日益增长的环保要求,来源于植物源的可降解缓冲包装材料的使用和开发引起了广泛的关注。鉴于此,本文以3种不同植物源的商业溶解浆为原料,基于其在NaOH/尿素水溶液中的溶解,通过模塑成型-再生进行了溶解浆纤维增强缓冲包装材料的制备研究。通过模塑成型材料干燥前后径向与厚度方向尺寸的测量,比较了不同助剂制备的缓冲材料的径向收缩率与厚度方向的收缩率,借助扫描电镜观察了制备的材料的断面形貌,通过拉伸试验绘制应力-应变曲线来分析浆纤维缓冲材料的力学性能,通过振动缓冲性能测试比较了制备的材料的振动缓冲性能。结果表明在7%NaOH/12%尿素水溶液中溶解和在99.5%CH3COOH中再生制备的材料比较柔软、再生容易。另外阔叶木溶解浆纤维制备的缓冲材料较硬,针叶木溶解浆纤维制备的缓冲材料和添加淀粉的竹溶解浆纤维制备的缓冲材料具备一定的振动缓冲性能。添加淀粉制备的竹溶解浆纤维缓冲材料的径向收缩率和厚度方向收缩率都是较小的,且有35%的延伸率。

With the increasingly stringent requirements of environmental protection,application of degradable cushioning packaging materials from plant sources and its development have attracted wide attention.Therefore,commercial dissolving pulps from three different plant sources were used as raw materials in this work,and preparation of pulp fibers reinforced cushioning packaging material was studied by molding followed by regeneration based on its dissolution in NaOH/urea aqueous solution.By measuring dimensions in radial and thickness directions,shrinkage in radial and thickness directions of molding materials before and after drying with different agent were compared.Morphology of cross-section was observed by scanning electron microscopic(SEM),and mechanical properties of pulp fibers cushioning materials was analyzed by stress-strain curves drawn from tensile test.Cushioning property of ultimate materials was compared by vibration cushioning test.The results showed that materials from dissolution in 7%NaOH/12%urea aqueous solution and regeneration by 99.5%CH3COOH were softer and easy to regenerate.Materials from hardwood dissolving pulp fibers were hard,and those from softwood dissolving pulp fibers and bamboo dissolving pulp fibers showed better cushioning property.Both radial shrinkage and shrinkage in thickness direction of cushioning materials from bamboo dissolving pulp fibers with starch were smaller than that of others,moreover their elongation was the largest,up to 35%.